I think this is certainly one of the more interesting shots from this challenge as it shows actual 'real world' chemistry taking place. So in this sense its very true to the challenge requirements. There are some great elements of interest in this photo, not least that cool looking red yellow lighting in the background.
This is obviously a candid shot and I think it would do well in stock photography, however I'm personally biased as I prefer my photography more in your face and beating you with the interest stick ;) I gave this a 6.